only and is not included on the GEOID99/G99SSS CD-ROM.
(click to enlarge image)
This one-arcminute model is based on the
G99SSS but
also reflects the information contained in the
GPSBM
data, much as the
GEOID99
model does. However, this
model references the ITFR96(1997.0) coordinate frame
rather than NAD83, hence it can be readily compared to
other data sets & models that also reference the ITRF
coordinate frame. As with
GEOID99,
caution should be
used whenever a comparison is made with data outside
of the conterminous United States (CONUS). Since the
extents of the
GPSBM
data set only reach the CONUS
boundary, regions outside of CONUS are extrapolated
and are increasingly invalid further outside of this
boundary.
In the conterminous United States, geoid heights range
from a low of -52.2 meters in the Atlantic (magenta) to a
high of 3.0 meters (red) in the Quebec, Canada region with
an average value of -29.9 meters, an RMS difference of 31.6
meters, and a standard deviation of 10.3 meters.
